;;; help.el --- help commands for Emacs
-;; Copyright (C) 1985, 1986, 1993, 1994, 1998, 1999, 2000 Free Software Foundation, Inc.
+;; Copyright (C) 1985, 1986, 1993, 1994, 1998, 1999, 2000, 2001, 2002,
+;; 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
;; Maintainer: FSF
;; Keywords: help, internal
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING. If not, write to the
-;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-;; Boston, MA 02111-1307, USA.
+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
;;; Commentary:
;; Get the macro make-help-screen when this is compiled,
;; or run interpreted, but not when the compiled code is loaded.
(eval-when-compile (require 'help-macro))
-(eval-when-compile (require 'view))
-(defvar help-map (make-sparse-keymap)
- "Keymap for characters following the Help key.")
+;; This makes `with-output-to-temp-buffer' buffers use `help-mode'.
+(add-hook 'temp-buffer-setup-hook 'help-mode-setup)
+(add-hook 'temp-buffer-show-hook 'help-mode-finish)
-(defvar help-mode-map (make-sparse-keymap)
- "Keymap for help mode.")
+(defvar help-map
+ (let ((map (make-sparse-keymap)))
+ (define-key map (char-to-string help-char) 'help-for-help)
+ (define-key map [help] 'help-for-help)
+ (define-key map [f1] 'help-for-help)
+ (define-key map "." 'display-local-help)
+ (define-key map "?" 'help-for-help)
+
+ (define-key map "\C-c" 'describe-copying)
+ (define-key map "\C-d" 'describe-distribution)
+ (define-key map "\C-e" 'view-emacs-problems)
+ (define-key map "\C-f" 'view-emacs-FAQ)
+ (define-key map "\C-m" 'view-order-manuals)
+ (define-key map "\C-n" 'view-emacs-news)
+ (define-key map "\C-p" 'describe-project)
+ (define-key map "\C-t" 'view-todo)
+ (define-key map "\C-w" 'describe-no-warranty)
+
+ ;; This does not fit the pattern, but it is natural given the C-\ command.
+ (define-key map "\C-\\" 'describe-input-method)
+
+ (define-key map "C" 'describe-coding-system)
+ (define-key map "F" 'Info-goto-emacs-command-node)
+ (define-key map "I" 'describe-input-method)
+ (define-key map "K" 'Info-goto-emacs-key-command-node)
+ (define-key map "L" 'describe-language-environment)
+ (define-key map "S" 'info-lookup-symbol)
+
+ (define-key map "a" 'apropos-command)
+ (define-key map "b" 'describe-bindings)
+ (define-key map "c" 'describe-key-briefly)
+ (define-key map "d" 'apropos-documentation)
+ (define-key map "e" 'view-echo-area-messages)
+ (define-key map "f" 'describe-function)
+ (define-key map "h" 'view-hello-file)
+
+ (define-key map "i" 'info)
+ (define-key map "4i" 'info-other-window)
+
+ (define-key map "k" 'describe-key)
+ (define-key map "l" 'view-lossage)
+ (define-key map "m" 'describe-mode)
+ (define-key map "n" 'view-emacs-news)
+ (define-key map "p" 'finder-by-keyword)
+ (define-key map "r" 'info-emacs-manual)
+ (define-key map "s" 'describe-syntax)
+ (define-key map "t" 'help-with-tutorial)
+ (define-key map "w" 'where-is)
+ (define-key map "v" 'describe-variable)
+ (define-key map "q" 'help-quit)
+ map)
+ "Keymap for characters following the Help key.")
(define-key global-map (char-to-string help-char) 'help-command)
(define-key global-map [help] 'help-command)
(define-key global-map [f1] 'help-command)
(fset 'help-command help-map)
-(define-key help-map (char-to-string help-char) 'help-for-help)
-(define-key help-map [help] 'help-for-help)
-(define-key help-map [f1] 'help-for-help)
-(define-key help-map "?" 'help-for-help)
-
-(define-key help-map "\C-c" 'describe-copying)
-(define-key help-map "\C-d" 'describe-distribution)
-(define-key help-map "\C-w" 'describe-no-warranty)
-(define-key help-map "\C-p" 'describe-project)
-(define-key help-map "a" 'apropos-command)
-
-(define-key help-map "b" 'describe-bindings)
-
-(define-key help-map "c" 'describe-key-briefly)
-(define-key help-map "k" 'describe-key)
-
-(define-key help-map "d" 'describe-function)
-(define-key help-map "f" 'describe-function)
-
-(define-key help-map "F" 'view-emacs-FAQ)
-
-(define-key help-map "i" 'info)
-(define-key help-map "4i" 'info-other-window)
-(define-key help-map "\C-f" 'Info-goto-emacs-command-node)
-(define-key help-map "\C-k" 'Info-goto-emacs-key-command-node)
-(define-key help-map "\C-i" 'info-lookup-symbol)
-
-(define-key help-map "l" 'view-lossage)
-
-(define-key help-map "m" 'describe-mode)
-
-(define-key help-map "\C-n" 'view-emacs-news)
-(define-key help-map "n" 'view-emacs-news)
-
-(define-key help-map "p" 'finder-by-keyword)
(autoload 'finder-by-keyword "finder"
"Find packages matching a given keyword." t)
-(define-key help-map "P" 'view-emacs-problems)
-
-(define-key help-map "s" 'describe-syntax)
-
-(define-key help-map "t" 'help-with-tutorial)
-
-(define-key help-map "w" 'where-is)
-
-(define-key help-map "v" 'describe-variable)
-
-(define-key help-map "q" 'help-quit)
-
-(define-key help-mode-map [mouse-2] 'help-follow-mouse)
-(define-key help-mode-map "\C-c\C-b" 'help-go-back)
-(define-key help-mode-map "\C-c\C-c" 'help-follow)
-(define-key help-mode-map "\t" 'help-next-ref)
-(define-key help-mode-map [backtab] 'help-previous-ref)
-(define-key help-mode-map [(shift tab)] 'help-previous-ref)
-;; Documentation only, since we use minor-mode-overriding-map-alist.
-(define-key help-mode-map "\r" 'help-follow)
-
-(defvar help-xref-stack nil
- "A stack of ways by which to return to help buffers after following xrefs.
-Used by `help-follow' and `help-xref-go-back'.
-An element looks like (POSITION FUNCTION ARGS...), where POSITION is
-`(POINT . BUFFER-NAME)'.
-To use the element, do (apply FUNCTION ARGS) then goto the point in
-the named buffer.")
-(put 'help-xref-stack 'permanent-local t)
-
-(defvar help-xref-stack-item nil
- "An item for `help-follow' in this buffer to push onto `help-xref-stack'.
-The format is (FUNCTION ARGS...).")
-(put 'help-xref-stack-item 'permanent-local t)
-
-(setq-default help-xref-stack nil help-xref-stack-item nil)
-
-(defcustom help-mode-hook nil
- "Hook run by `help-mode'."
- :type 'hook
- :group 'help)
-
-(defun help-mode ()
- "Major mode for viewing help text and navigating references in it.
-Entry to this mode runs the normal hook `help-mode-hook'.
-Commands:
-\\{help-mode-map}"
- (interactive)
- (kill-all-local-variables)
- (use-local-map help-mode-map)
- (setq mode-name "Help")
- (setq major-mode 'help-mode)
- (make-local-variable 'font-lock-defaults)
- (setq font-lock-defaults nil) ; font-lock would defeat xref
- (view-mode)
- (make-local-variable 'view-no-disable-on-exit)
- (setq view-no-disable-on-exit t)
- ;; `help-make-xrefs' would be run here if not invoked from
- ;; `help-mode-maybe'.
- (run-hooks 'help-mode-hook))
-
-(defun help-mode-setup ()
- (help-mode)
- (setq buffer-read-only nil))
-
-(add-hook 'temp-buffer-setup-hook 'help-mode-setup)
-
-(defun help-mode-finish ()
- (when (eq major-mode 'help-mode)
- ;; View mode's read-only status of existing *Help* buffer is lost
- ;; by with-output-to-temp-buffer.
- (toggle-read-only 1)
- (help-make-xrefs (current-buffer)))
- (setq view-return-to-alist
- (list (cons (selected-window) help-return-method))))
-
-(add-hook 'temp-buffer-show-hook 'help-mode-finish)
+;; insert-button makes the action nil if it is not store somewhere
+(defvar help-button-cache nil)
+\f
(defun help-quit ()
"Just exit from the Help command's command loop."
(interactive)
nil)
-(defun help-with-tutorial (&optional arg)
- "Select the Emacs learn-by-doing tutorial.
-If there is a tutorial version written in the language
-of the selected language environment, that version is used.
-If there's no tutorial in that language, `TUTORIAL' is selected.
-With arg, you are asked to choose which language."
- (interactive "P")
- (let ((lang (if arg
- (read-language-name 'tutorial "Language: " "English")
- (if (get-language-info current-language-environment 'tutorial)
- current-language-environment
- "English")))
- file filename)
- (setq filename (get-language-info lang 'tutorial))
- (setq file (expand-file-name (concat "~/" filename)))
- (delete-other-windows)
- (if (get-file-buffer file)
- (switch-to-buffer (get-file-buffer file))
- (switch-to-buffer (create-file-buffer file))
- (setq buffer-file-name file)
- (setq default-directory (expand-file-name "~/"))
- (setq buffer-auto-save-file-name nil)
- (insert-file-contents (expand-file-name filename data-directory))
- (goto-char (point-min))
- (search-forward "\n<<")
- (beginning-of-line)
- (delete-region (point) (progn (end-of-line) (point)))
- (let ((n (- (window-height (selected-window))
- (count-lines (point-min) (point))
- 6)))
- (if (< n 12)
- (newline n)
- ;; Some people get confused by the large gap.
- (newline (/ n 2))
- (insert "[Middle of page left blank for didactic purposes. "
- "Text continues below]")
- (newline (- n (/ n 2)))))
- (goto-char (point-min))
- (set-buffer-modified-p nil))))
-
-(defun mode-line-key-binding (key)
- "Value is the binding of KEY in the mode line or nil if none."
- (let (string-info defn)
- (when (and (eq 'mode-line (aref key 0))
- (consp (setq string-info (nth 4 (event-start (aref key 1))))))
- (let* ((string (car string-info))
- (pos (cdr string-info))
- (local-map (and (> pos 0)
- (< pos (length string))
- (get-text-property pos 'local-map string))))
- (setq defn (and local-map (lookup-key local-map key)))))
- defn))
-
-(defun describe-key-briefly (key &optional insert)
- "Print the name of the function KEY invokes. KEY is a string.
-If INSERT (the prefix arg) is non-nil, insert the message in the buffer."
- (interactive "kDescribe key briefly: \nP")
- (save-excursion
- (let ((modifiers (event-modifiers (aref key 0)))
- (standard-output (if insert (current-buffer) t))
- window position)
- ;; For a mouse button event, go to the button it applies to
- ;; to get the right key bindings. And go to the right place
- ;; in case the keymap depends on where you clicked.
- (if (or (memq 'click modifiers) (memq 'down modifiers)
- (memq 'drag modifiers))
- (setq window (posn-window (event-start (aref key 0)))
- position (posn-point (event-start (aref key 0)))))
- (if (windowp window)
- (progn
- (set-buffer (window-buffer window))
- (goto-char position)))
- ;; Ok, now look up the key and name the command.
- (let ((defn (or (mode-line-key-binding key)
- (key-binding key)))
- (key-desc (key-description key)))
- (if (or (null defn) (integerp defn))
- (princ (format "%s is undefined" key-desc))
- (princ (format (if insert
- "`%s' (`%s')"
- (if (windowp window)
- "%s at that spot runs the command %s"
- "%s runs the command %s"))
- key-desc
- (if (symbolp defn) defn (prin1-to-string defn)))))))))
-
(defvar help-return-method nil
"What to do to \"exit\" the help buffer.
This is a list
- (WINDOW . t) delete the selected window, go to WINDOW.
+ (WINDOW . t) delete the selected window (and possibly its frame,
+ see `quit-window' and `View-quit'), go to WINDOW.
(WINDOW . quit-window) do quit-window, then select WINDOW.
(WINDOW BUF START POINT) display BUF at START, POINT, then select WINDOW.")
(defun print-help-return-message (&optional function)
"Display or return message saying how to restore windows after help command.
-Computes a message and applies the optional argument FUNCTION to it.
-If FUNCTION is nil, applies `message' to it, thus printing it."
+This function assumes that `standard-output' is the help buffer.
+It computes a message, and applies the optional argument FUNCTION to it.
+If FUNCTION is nil, it applies `message', thus displaying the message.
+In addition, this function sets up `help-return-method', which see, that
+specifies what to do when the user exits the help buffer."
(and (not (get-buffer-window standard-output))
(let ((first-message
- (cond ((special-display-p (buffer-name standard-output))
+ (cond ((or
+ pop-up-frames
+ (special-display-p (buffer-name standard-output)))
(setq help-return-method (cons (selected-window) t))
;; If the help output buffer is a special display buffer,
;; don't say anything about how to get rid of it.
((not (one-window-p t))
(setq help-return-method
(cons (selected-window) 'quit-window))
- "Type \\[switch-to-buffer-other-window] RET to restore the other window.")
+ "Type \\[display-buffer] RET to restore the other window.")
(pop-up-windows
(setq help-return-method (cons (selected-window) t))
"Type \\[delete-other-windows] to remove help window.")
(if first-message " ")
;; If the help buffer will go in a separate frame,
;; it's no use mentioning a command to scroll, so don't.
- (if (special-display-p (buffer-name standard-output))
+ (if (or pop-up-windows
+ (special-display-p (buffer-name standard-output)))
nil
(if (same-window-p (buffer-name standard-output))
;; Say how to scroll this window.
(substitute-command-keys
"\\[scroll-other-window] to scroll the help."))))))))
-(defun describe-key (key)
- "Display documentation of the function invoked by KEY. KEY is a string."
- (interactive "kDescribe key: ")
- (save-excursion
- (let ((modifiers (event-modifiers (aref key 0)))
- window position)
- ;; For a mouse button event, go to the button it applies to
- ;; to get the right key bindings. And go to the right place
- ;; in case the keymap depends on where you clicked.
- (if (or (memq 'click modifiers) (memq 'down modifiers)
- (memq 'drag modifiers))
- (setq window (posn-window (event-start (aref key 0)))
- position (posn-point (event-start (aref key 0)))))
- (if (windowp window)
- (progn
- (set-buffer (window-buffer window))
- (goto-char position)))
- (let ((defn (or (mode-line-key-binding key) (key-binding key))))
- (if (or (null defn) (integerp defn))
- (message "%s is undefined" (key-description key))
- (with-output-to-temp-buffer "*Help*"
- (princ (key-description key))
- (if (windowp window)
- (princ " at that spot"))
- (princ " runs the command ")
- (prin1 defn)
- (princ "\n which is ")
- (describe-function-1 defn nil (interactive-p))
- (print-help-return-message)))))))
+;; So keyboard macro definitions are documented correctly
+(fset 'defining-kbd-macro (symbol-function 'start-kbd-macro))
-(defun describe-mode ()
- "Display documentation of current major mode and minor modes.
-The major mode description comes first, followed by the minor modes,
-each on a separate page.
+(defalias 'help 'help-for-help-internal)
+;; find-function can find this.
+(defalias 'help-for-help 'help-for-help-internal)
+;; It can't find this, but nobody will look.
+(make-help-screen help-for-help-internal
+ "a b c C e f F i I k C-k l L m p r s t v w C-c C-d C-f C-n C-p C-t C-w . or ? :"
+ "You have typed %THIS-KEY%, the help character. Type a Help option:
+\(Use SPC or DEL to scroll through this text. Type \\<help-map>\\[help-quit] to exit the Help command.)
-For this to work correctly for a minor mode, the mode's indicator variable
-\(listed in `minor-mode-alist') must also be a function whose documentation
-describes the minor mode."
- (interactive)
- (with-output-to-temp-buffer "*Help*"
- (when minor-mode-alist
- (princ "The major mode is described first.
-For minor modes, see following pages.\n\n"))
- (princ mode-name)
- (princ " mode:\n")
- (princ (documentation major-mode))
- (help-setup-xref (list #'help-xref-mode (current-buffer)) (interactive-p))
- (let ((minor-modes minor-mode-alist))
- (while minor-modes
- (let* ((minor-mode (car (car minor-modes)))
- (indicator (car (cdr (car minor-modes)))))
- ;; Document a minor mode if it is listed in minor-mode-alist,
- ;; bound locally in this buffer, non-nil, and has a function
- ;; definition.
- (if (and (boundp minor-mode)
- (symbol-value minor-mode)
- (fboundp minor-mode))
- (let ((pretty-minor-mode minor-mode))
- (if (string-match "-mode$" (symbol-name minor-mode))
- (setq pretty-minor-mode
- (capitalize
- (substring (symbol-name minor-mode)
- 0 (match-beginning 0)))))
- (while (and indicator (symbolp indicator)
- (boundp indicator)
- (not (eq indicator (symbol-value indicator))))
- (setq indicator (symbol-value indicator)))
- (princ "\n\f\n")
- (princ (format "%s minor mode (%s):\n"
- pretty-minor-mode
- (if indicator
- (format "indicator%s" indicator)
- "no indicator")))
- (princ (documentation minor-mode)))))
- (setq minor-modes (cdr minor-modes))))
- (print-help-return-message)))
+a command-apropos. Type a list of words or a regexp; it shows a list of
+ commands whose names match. See also the apropos command.
+b describe-bindings. Display a table of all key bindings.
+c describe-key-briefly. Type a key sequence;
+ it displays the command name run by that key sequence.
+C describe-coding-system. Type the name of the coding system to describe,
+ or just RET to describe the ones currently in use.
+d apropos-documentation. Type a pattern (a list of words or a regexp), and
+ it shows a list of functions, variables, and other items whose
+ documentation matches that pattern. See also the apropos command.
+e view-echo-area-messages. Go to the buffer that logs echo-area messages.
+f describe-function. Type a function name and you see its documentation.
+F Info-goto-emacs-command-node. Type a command name;
+ it goes to the on-line manual's section that describes the command.
+h Display the HELLO file which illustrates various scripts.
+i info. The Info documentation reader: read on-line manuals.
+I describe-input-method. Describe a specific input method (if you type
+ its name) or the current input method (if you type just RET).
+k describe-key. Type a key sequence;
+ it displays the full documentation for that key sequence.
+K Info-goto-emacs-key-command-node. Type a key sequence;
+ it goes to the on-line manual's section that describes
+ the command bound to that key.
+l view-lossage. Show last 100 characters you typed.
+L describe-language-environment. This describes either a
+ specific language environment (if you type its name)
+ or the current language environment (if you type just RET).
+m describe-mode. Display documentation of current minor modes,
+ and the current major mode, including their special commands.
+n view-emacs-news. Display news of recent Emacs changes.
+p finder-by-keyword. Find packages matching a given topic keyword.
+r info-emacs-manual. Display the Emacs manual in Info mode.
+s describe-syntax. Display contents of syntax table, plus explanations.
+S info-lookup-symbol. Type a symbol; it goes to that symbol in the
+ on-line manual for the programming language used in this buffer.
+t help-with-tutorial. Select the Emacs learn-by-doing tutorial.
+v describe-variable. Type name of a variable;
+ it displays the variable's documentation and value.
+w where-is. Type a command name; it displays which keystrokes
+ invoke that command.
+. display-local-help. Display any available local help at point
+ in the echo area.
-;; So keyboard macro definitions are documented correctly
-(fset 'defining-kbd-macro (symbol-function 'start-kbd-macro))
+C-c Display Emacs copying permission (GNU General Public License).
+C-d Display Emacs ordering information.
+C-e Display info about Emacs problems.
+C-f Display the Emacs FAQ.
+C-m Display how to order printed Emacs manuals.
+C-n Display news of recent Emacs changes.
+C-p Display information about the GNU project.
+C-t Display the Emacs TODO list.
+C-w Display information on absence of warranty for GNU Emacs."
+ help-map)
+
+\f
+
+(defun function-called-at-point ()
+ "Return a function around point or else called by the list containing point.
+If that doesn't give a function, return nil."
+ (or (with-syntax-table emacs-lisp-mode-syntax-table
+ (or (condition-case ()
+ (save-excursion
+ (or (not (zerop (skip-syntax-backward "_w")))
+ (eq (char-syntax (following-char)) ?w)
+ (eq (char-syntax (following-char)) ?_)
+ (forward-sexp -1))
+ (skip-chars-forward "'")
+ (let ((obj (read (current-buffer))))
+ (and (symbolp obj) (fboundp obj) obj)))
+ (error nil))
+ (condition-case ()
+ (save-excursion
+ (save-restriction
+ (narrow-to-region (max (point-min)
+ (- (point) 1000)) (point-max))
+ ;; Move up to surrounding paren, then after the open.
+ (backward-up-list 1)
+ (forward-char 1)
+ ;; If there is space here, this is probably something
+ ;; other than a real Lisp function call, so ignore it.
+ (if (looking-at "[ \t]")
+ (error "Probably not a Lisp function call"))
+ (let ((obj (read (current-buffer))))
+ (and (symbolp obj) (fboundp obj) obj))))
+ (error nil))))
+ (let* ((str (find-tag-default))
+ (sym (if str (intern-soft str))))
+ (if (and sym (fboundp sym))
+ sym
+ (save-match-data
+ (when (and str (string-match "\\`\\W*\\(.*?\\)\\W*\\'" str))
+ (setq sym (intern-soft (match-string 1 str)))
+ (and (fboundp sym) sym)))))))
+
+\f
+;;; `User' help functions
(defun describe-distribution ()
"Display info on how to obtain the latest version of GNU Emacs."
(interactive)
- (find-file-read-only
- (expand-file-name "DISTRIB" data-directory)))
+ (view-file (expand-file-name "DISTRIB" data-directory)))
(defun describe-copying ()
"Display info on how you may redistribute copies of GNU Emacs."
(interactive)
- (find-file-read-only
- (expand-file-name "COPYING" data-directory))
+ (view-file (expand-file-name "COPYING" data-directory))
(goto-char (point-min)))
(defun describe-project ()
"Display info on the GNU project."
(interactive)
- (find-file-read-only
- (expand-file-name "GNU" data-directory))
+ (view-file (expand-file-name "THE-GNU-PROJECT" data-directory))
(goto-char (point-min)))
(defun describe-no-warranty ()
(aset prefix i (aref key i))
(setq i (1+ i)))
prefix)))))
-;; Make C-h after a prefix, when not specifically bound,
+;; Make C-h after a prefix, when not specifically bound,
;; run describe-prefix-bindings.
(setq prefix-help-command 'describe-prefix-bindings)
-(defun view-emacs-news (&optional arg)
+(defun view-emacs-news (&optional version)
"Display info on recent changes to Emacs.
-With numeric argument, display information on correspondingly older changes."
+With argument, display info only for the selected version."
(interactive "P")
- (let* ((arg (if arg (prefix-numeric-value arg) 0))
- (file (cond ((eq arg 0) "NEWS")
- ((eq arg 1) "ONEWS")
- (t
- (nth (- arg 2)
- (nreverse (directory-files data-directory
- nil "^ONEWS\\.[0-9]+$"
- nil)))))))
- (if file
- (find-file-read-only (expand-file-name file data-directory))
- (error "No such old news"))))
+ (unless version
+ (setq version emacs-major-version))
+ (when (consp version)
+ (let* ((all-versions
+ (let (res)
+ (mapcar
+ (lambda (file)
+ (with-temp-buffer
+ (insert-file-contents
+ (expand-file-name file data-directory))
+ (while (re-search-forward
+ (if (member file '("NEWS.18" "NEWS.1-17"))
+ "Changes in \\(?:Emacs\\|version\\)?[ \t]*\\([0-9]+\\(?:\\.[0-9]+\\)?\\)"
+ "^\* [^0-9\n]*\\([0-9]+\\.[0-9]+\\)") nil t)
+ (setq res (cons (match-string-no-properties 1) res)))))
+ (cons "NEWS"
+ (directory-files data-directory nil
+ "^NEWS\\.[0-9][-0-9]*$" nil)))
+ (sort (delete-dups res) (lambda (a b) (string< b a)))))
+ (current (car all-versions)))
+ (setq version (completing-read
+ (format "Read NEWS for the version (default %s): " current)
+ all-versions nil nil nil nil current))
+ (if (integerp (string-to-number version))
+ (setq version (string-to-number version))
+ (unless (or (member version all-versions)
+ (<= (string-to-number version) (string-to-number current)))
+ (error "No news about version %s" version)))))
+ (when (integerp version)
+ (cond ((<= version 12)
+ (setq version (format "1.%d" version)))
+ ((<= version 18)
+ (setq version (format "%d" version)))
+ ((> version emacs-major-version)
+ (error "No news about emacs %d (yet)" version))))
+ (let* ((vn (if (stringp version)
+ (string-to-number version)
+ version))
+ (file (cond
+ ((>= vn emacs-major-version) "NEWS")
+ ((< vn 18) "NEWS.1-17")
+ (t (format "NEWS.%d" vn))))
+ res)
+ (view-file (expand-file-name file data-directory))
+ (widen)
+ (goto-char (point-min))
+ (when (stringp version)
+ (when (re-search-forward
+ (concat (if (< vn 19)
+ "Changes in Emacs[ \t]*"
+ "^\* [^0-9\n]*") version "$")
+ nil t)
+ (beginning-of-line)
+ (narrow-to-region
+ (point)
+ (save-excursion
+ (while (and (setq res
+ (re-search-forward
+ (if (< vn 19)
+ "Changes in \\(?:Emacs\\|version\\)?[ \t]*\\([0-9]+\\(?:\\.[0-9]+\\)?\\)"
+ "^\* [^0-9\n]*\\([0-9]+\\.[0-9]+\\)") nil t))
+ (equal (match-string-no-properties 1) version)))
+ (or res (goto-char (point-max)))
+ (beginning-of-line)
+ (point)))))))
+
+
+(defun view-todo (&optional arg)
+ "Display the Emacs TODO list."
+ (interactive "P")
+ (view-file (expand-file-name "TODO" data-directory)))
+
+(defun view-echo-area-messages ()
+ "View the log of recent echo-area messages: the `*Messages*' buffer.
+The number of messages retained in that buffer
+is specified by the variable `message-log-max'."
+ (interactive)
+ (switch-to-buffer (get-buffer-create "*Messages*")))
+
+(defun view-order-manuals ()
+ "Display the Emacs ORDERS file."
+ (interactive)
+ (view-file (expand-file-name "ORDERS" data-directory))
+ (goto-address))
(defun view-emacs-FAQ ()
"Display the Emacs Frequently Asked Questions (FAQ) file."
(interactive)
-;;; (find-file-read-only (expand-file-name "FAQ" data-directory))
+ ;; (find-file-read-only (expand-file-name "FAQ" data-directory))
(info "(efaq)"))
(defun view-emacs-problems ()
(view-file (expand-file-name "PROBLEMS" data-directory)))
(defun view-lossage ()
- "Display last 100 input keystrokes."
+ "Display last 100 input keystrokes.
+
+To record all your input on a file, use `open-dribble-file'."
(interactive)
- (with-output-to-temp-buffer "*Help*"
- (princ (mapconcat (function (lambda (key)
- (if (or (integerp key)
- (symbolp key)
- (listp key))
- (single-key-description key)
- (prin1-to-string key nil))))
+ (help-setup-xref (list #'view-lossage) (interactive-p))
+ (with-output-to-temp-buffer (help-buffer)
+ (princ (mapconcat (lambda (key)
+ (if (or (integerp key) (symbolp key) (listp key))
+ (single-key-description key)
+ (prin1-to-string key nil)))
(recent-keys)
" "))
- (save-excursion
- (set-buffer standard-output)
+ (with-current-buffer standard-output
(goto-char (point-min))
(while (progn (move-to-column 50) (not (eobp)))
- (search-forward " " nil t)
- (insert "\n"))
- (setq help-xref-stack nil
- help-xref-stack-item nil))
+ (when (search-forward " " nil t)
+ (delete-char -1))
+ (insert "\n")))
(print-help-return-message)))
-(defalias 'help 'help-for-help)
-(make-help-screen help-for-help
- "a b c C f F C-f i I k C-k l L m n p s t v w C-c C-d C-n C-p C-w; ? for help:"
- "You have typed %THIS-KEY%, the help character. Type a Help option:
-\(Use SPC or DEL to scroll through this text. Type \\<help-map>\\[help-quit] to exit the Help command.)
-
-a command-apropos. Give a substring, and see a list of commands
- (functions interactively callable) that contain
- that substring. See also the apropos command.
-b describe-bindings. Display table of all key bindings.
-c describe-key-briefly. Type a command key sequence;
- it prints the function name that sequence runs.
-C describe-coding-system. This describes either a specific coding system
- (if you type its name) or the coding systems currently in use
- (if you type just RET).
-f describe-function. Type a function name and get documentation of it.
-C-f Info-goto-emacs-command-node. Type a function name;
- it takes you to the Info node for that command.
-i info. The info documentation reader.
-I describe-input-method. Describe a specific input method (if you type
- its name) or the current input method (if you type just RET).
-C-i info-lookup-symbol. Display the definition of a specific symbol
- as found in the manual for the language this buffer is written in.
-k describe-key. Type a command key sequence;
- it displays the full documentation.
-C-k Info-goto-emacs-key-command-node. Type a command key sequence;
- it takes you to the Info node for the command bound to that key.
-l view-lossage. Show last 100 characters you typed.
-L describe-language-environment. This describes either a
- specific language environment (if you type its name)
- or the current language environment (if you type just RET).
-m describe-mode. Print documentation of current minor modes,
- and the current major mode, including their special commands.
-n view-emacs-news. Display news of recent Emacs changes.
-p finder-by-keyword. Find packages matching a given topic keyword.
-s describe-syntax. Display contents of syntax table, plus explanations
-t help-with-tutorial. Select the Emacs learn-by-doing tutorial.
-v describe-variable. Type name of a variable;
- it displays the variable's documentation and value.
-w where-is. Type command name; it prints which keystrokes
- invoke that command.
-
-F Display the frequently asked questions file.
-h Display the HELLO file which illustrates various scripts.
-C-c Display Emacs copying permission (General Public License).
-C-d Display Emacs ordering information.
-C-n Display news of recent Emacs changes.
-C-p Display information about the GNU project.
-C-w Display information on absence of warranty for GNU Emacs."
- help-map)
-
-(defun function-called-at-point ()
- "Return a function around point or else called by the list containing point.
-If that doesn't give a function, return nil."
- (with-syntax-table emacs-lisp-mode-syntax-table
- (or (condition-case ()
- (save-excursion
- (or (not (zerop (skip-syntax-backward "_w")))
- (eq (char-syntax (following-char)) ?w)
- (eq (char-syntax (following-char)) ?_)
- (forward-sexp -1))
- (skip-chars-forward "'")
- (let ((obj (read (current-buffer))))
- (and (symbolp obj) (fboundp obj) obj)))
- (error nil))
- (condition-case ()
- (save-excursion
- (save-restriction
- (narrow-to-region (max (point-min)
- (- (point) 1000)) (point-max))
- ;; Move up to surrounding paren, then after the open.
- (backward-up-list 1)
- (forward-char 1)
- ;; If there is space here, this is probably something
- ;; other than a real Lisp function call, so ignore it.
- (if (looking-at "[ \t]")
- (error "Probably not a Lisp function call"))
- (let ((obj (read (current-buffer))))
- (and (symbolp obj) (fboundp obj) obj))))
- (error nil)))))
-
-(defvar symbol-file-load-history-loaded nil
- "Non-nil means we have loaded the file `fns-VERSION.el' in `exec-directory'.
-That file records the part of `load-history' for preloaded files,
-which is cleared out before dumping to make Emacs smaller.")
-
-(defun symbol-file (function)
- "Return the input source from which FUNCTION was loaded.
-The value is normally a string that was passed to `load':
-either an absolute file name, or a library name
-\(with no directory name and no `.el' or `.elc' at the end).
-It can also be nil, if the definition is not associated with any file."
- (unless symbol-file-load-history-loaded
- (load (expand-file-name
- ;; fns-XX.YY.ZZ.el does not work on DOS filesystem.
- (if (eq system-type 'ms-dos)
- "fns.el"
- (format "fns-%s.el" emacs-version))
- exec-directory)
- ;; The file name fns-%s.el already has a .el extension.
- nil nil t)
- (setq symbol-file-load-history-loaded t))
- (let ((files load-history)
- file functions)
- (while files
- (if (memq function (cdr (car files)))
- (setq file (car (car files)) files nil))
- (setq files (cdr files)))
- file))
-
-(defun describe-function (function)
- "Display the full documentation of FUNCTION (a symbol)."
- (interactive
- (let ((fn (function-called-at-point))
- (enable-recursive-minibuffers t)
- val)
- (setq val (completing-read (if fn
- (format "Describe function (default %s): " fn)
- "Describe function: ")
- obarray 'fboundp t nil nil (symbol-name fn)))
- (list (if (equal val "")
- fn (intern val)))))
- (if function
- (with-output-to-temp-buffer "*Help*"
- (prin1 function)
- ;; Use " is " instead of a colon so that
- ;; it is easier to get out the function name using forward-sexp.
- (princ " is ")
- (describe-function-1 function nil (interactive-p))
- (print-help-return-message)
- (save-excursion
- (set-buffer standard-output)
- ;; Return the text we displayed.
- (buffer-string)))
- (message "You didn't specify a function")))
-
-(defun describe-function-1 (function parens interactive-p)
- (let* ((def (if (symbolp function)
- (symbol-function function)
- function))
- file-name string need-close
- (beg (if (commandp def) "an interactive " "a ")))
- (setq string
- (cond ((or (stringp def)
- (vectorp def))
- "a keyboard macro")
- ((subrp def)
- (if (eq 'unevalled (cdr (subr-arity def)))
- (concat beg "special form")
- (concat beg "built-in function")))
- ((byte-code-function-p def)
- (concat beg "compiled Lisp function"))
- ((symbolp def)
- (while (symbolp (symbol-function def))
- (setq def (symbol-function def)))
- (format "an alias for `%s'" def))
- ((eq (car-safe def) 'lambda)
- (concat beg "Lisp function"))
- ((eq (car-safe def) 'macro)
- "a Lisp macro")
- ((eq (car-safe def) 'mocklisp)
- "a mocklisp function")
- ((eq (car-safe def) 'autoload)
- (setq file-name (nth 1 def))
- (format "%s autoloaded %s"
- (if (commandp def) "an interactive" "an")
- (if (eq (nth 4 def) 'keymap) "keymap"
- (if (nth 4 def) "Lisp macro" "Lisp function"))
- ))
- ;; perhaps use keymapp here instead
- ((eq (car-safe def) 'keymap)
- (let ((is-full nil)
- (elts (cdr-safe def)))
- (while elts
- (if (char-table-p (car-safe elts))
- (setq is-full t
- elts nil))
- (setq elts (cdr-safe elts)))
- (if is-full
- "a full keymap"
- "a sparse keymap")))
- (t "")))
- (when (and parens (not (equal string "")))
- (setq need-close t)
- (princ "("))
- (princ string)
- (with-current-buffer "*Help*"
- (save-excursion
- (save-match-data
- (if (re-search-backward "alias for `\\([^`']+\\)'" nil t)
- (help-xref-button 1 #'describe-function def
- "mouse-2, RET: describe this function")))))
- (or file-name
- (setq file-name (symbol-file function)))
- (if file-name
- (progn
- (princ " in `")
- ;; We used to add .el to the file name,
- ;; but that's completely wrong when the user used load-file.
- (princ file-name)
- (princ "'")
- ;; Make a hyperlink to the library.
- (with-current-buffer "*Help*"
- (save-excursion
- (re-search-backward "`\\([^`']+\\)'" nil t)
- (help-xref-button 1 #'(lambda (arg)
- (let ((location
- (find-function-noselect arg)))
- (pop-to-buffer (car location))
- (goto-char (cdr location))))
- function
- "mouse-2, RET: find function's definition")))))
- (if need-close (princ ")"))
- (princ ".")
- (terpri)
- ;; Handle symbols aliased to other symbols.
- (setq def (indirect-function def))
- ;; If definition is a macro, find the function inside it.
- (if (eq (car-safe def) 'macro)
- (setq def (cdr def)))
- (let ((arglist (cond ((byte-code-function-p def)
- (car (append def nil)))
- ((eq (car-safe def) 'lambda)
- (nth 1 def))
- ((and (eq (car-safe def) 'autoload)
- (not (eq (nth 4 def) 'keymap)))
- (concat "[Arg list not available until "
- "function definition is loaded.]"))
- (t t))))
- (cond ((listp arglist)
- (princ (cons (if (symbolp function) function "anonymous")
- (mapcar (lambda (arg)
- (if (memq arg '(&optional &rest))
- arg
- (intern (upcase (symbol-name arg)))))
- arglist)))
- (terpri))
- ((stringp arglist)
- (princ arglist)
- (terpri))))
- (let ((doc (documentation function)))
- (if doc
- (progn (terpri)
- (princ doc)
- (if (subrp (symbol-function function))
- (with-current-buffer standard-output
- (beginning-of-line)
- ;; Builtins get the calling sequence at the end of
- ;; the doc string. Move it to the same place as
- ;; for other functions.
-
- ;; In cases where `function' has been fset to a
- ;; subr we can't search for function's name in
- ;; the doc string. Kluge round that using the
- ;; printed representation. The arg list then
- ;; shows the wrong function name, but that
- ;; might be a useful hint.
- (let* ((rep (prin1-to-string def))
- (name (progn
- (string-match " \\([^ ]+\\)>$" rep)
- (match-string 1 rep))))
- (if (looking-at (format "(%s[ )]" (regexp-quote name)))
- (let ((start (point-marker)))
- (goto-char (point-min))
- (forward-paragraph)
- (insert-buffer-substring (current-buffer) start)
- (insert ?\n)
- (delete-region (1- start) (point-max)))
- (goto-char (point-min))
- (forward-paragraph)
- (insert
- "[Missing arglist. Please make a bug report.]\n")))
- (goto-char (point-max))))
- (help-setup-xref (list #'describe-function function)
- interactive-p))
- (princ "not documented")))))
-
-(defun variable-at-point ()
- "Return the bound variable symbol found around point.
-Return 0 if there is no such symbol."
- (condition-case ()
- (with-syntax-table emacs-lisp-mode-syntax-table
- (save-excursion
- (or (not (zerop (skip-syntax-backward "_w")))
- (eq (char-syntax (following-char)) ?w)
- (eq (char-syntax (following-char)) ?_)
- (forward-sexp -1))
- (skip-chars-forward "'")
- (let ((obj (read (current-buffer))))
- (or (and (symbolp obj) (boundp obj) obj)
- 0))))
- (error 0)))
-
-(defun help-xref-on-pp (from to)
- "Add xrefs for symbols in `pp's output between FROM and TO."
- (let ((ost (syntax-table)))
- (unwind-protect
- (save-excursion
- (save-restriction
- (set-syntax-table emacs-lisp-mode-syntax-table)
- (narrow-to-region from to)
- (goto-char (point-min))
- (while (not (eobp))
- (cond
- ((looking-at "\"") (forward-sexp 1))
- ((looking-at "#<") (search-forward ">" nil 'move))
- ((looking-at "\\(\\(\\sw\\|\\s_\\)+\\)")
- (let* ((sym (intern-soft (match-string 1)))
- (fn (cond ((fboundp sym) #'describe-function)
- ((or (memq sym '(t nil))
- (keywordp sym))
- nil)
- ((and sym (boundp sym))
- #'describe-variable))))
- (when fn (help-xref-button 1 fn sym)))
- (goto-char (match-end 1)))
- (t (forward-char 1))))))
- (set-syntax-table ost))))
-
-(defun describe-variable (variable &optional buffer)
- "Display the full documentation of VARIABLE (a symbol).
-Returns the documentation as a string, also.
-If VARIABLE has a buffer-local value in BUFFER (default to the current buffer),
-it is displayed along with the global value."
- (interactive
- (let ((v (variable-at-point))
- (enable-recursive-minibuffers t)
- val)
- (setq val (completing-read (if (symbolp v)
- (format
- "Describe variable (default %s): " v)
- "Describe variable: ")
- obarray 'boundp t nil nil
- (if (symbolp v) (symbol-name v))))
- (list (if (equal val "")
- v (intern val)))))
- (unless (bufferp buffer) (setq buffer (current-buffer)))
- (if (not (symbolp variable))
- (message "You did not specify a variable")
- (let (valvoid)
- (with-current-buffer buffer
- (with-output-to-temp-buffer "*Help*"
- (prin1 variable)
- (if (not (boundp variable))
- (progn
- (princ " is void")
- (setq valvoid t))
- (let ((val (symbol-value variable)))
- (with-current-buffer standard-output
- (princ "'s value is ")
- (terpri)
- (let ((from (point)))
- (pp val)
- (help-xref-on-pp from (point))))))
- (terpri)
- (if (local-variable-p variable)
- (progn
- (princ (format "Local in buffer %s; " (buffer-name)))
- (if (not (default-boundp variable))
- (princ "globally void")
- (let ((val (default-value variable)))
- (with-current-buffer standard-output
- (princ "global value is ")
- (terpri)
- ;; Fixme: pp can take an age if you happen to
- ;; ask for a very large expression. We should
- ;; probably print it raw once and check it's a
- ;; sensible size before prettyprinting. -- fx
- (let ((from (point)))
- (pp val)
- (help-xref-on-pp from (point))))))
- (terpri)))
- (terpri)
- (with-current-buffer standard-output
- (if (> (count-lines (point-min) (point-max)) 10)
- (progn
- ;; Note that setting the syntax table like below
- ;; makes forward-sexp move over a `'s' at the end
- ;; of a symbol.
- (set-syntax-table emacs-lisp-mode-syntax-table)
- (goto-char (point-min))
- (if valvoid
- (forward-line 1)
- (forward-sexp 1)
- (delete-region (point) (progn (end-of-line) (point)))
- (insert " value is shown below.\n\n")
- (save-excursion
- (insert "\n\nValue:"))))))
- (princ "Documentation:")
- (terpri)
- (let ((doc (documentation-property variable 'variable-documentation)))
- (princ (or doc "not documented as a variable.")))
- (help-setup-xref (list #'describe-variable variable (current-buffer))
- (interactive-p))
-
- ;; Make a link to customize if this variable can be customized.
- ;; Note, it is not reliable to test only for a custom-type property
- ;; because those are only present after the var's definition
- ;; has been loaded.
- (if (or (get variable 'custom-type) ; after defcustom
- (get variable 'custom-loads) ; from loaddefs.el
- (get variable 'standard-value)) ; from cus-start.el
- (let ((customize-label "customize"))
- (terpri)
- (terpri)
- (princ (concat "You can " customize-label " this variable."))
- (with-current-buffer "*Help*"
- (save-excursion
- (re-search-backward
- (concat "\\(" customize-label "\\)") nil t)
- (help-xref-button 1 (lambda (v)
- (if help-xref-stack
- (pop help-xref-stack))
- (customize-variable v))
- variable
- "mouse-2, RET: customize variable")))))
- ;; Make a hyperlink to the library if appropriate. (Don't
- ;; change the format of the buffer's initial line in case
- ;; anything expects the current format.)
- (let ((file-name (symbol-file variable)))
- (when file-name
- (princ "\n\nDefined in `")
- (princ file-name)
- (princ "'.")
- (with-current-buffer "*Help*"
- (save-excursion
- (re-search-backward "`\\([^`']+\\)'" nil t)
- (help-xref-button
- 1 (lambda (arg)
- (let ((location
- (find-variable-noselect arg)))
- (pop-to-buffer (car location))
- (goto-char (cdr location))))
- variable "mouse-2, RET: find variable's definition")))))
-
- (print-help-return-message)
- (save-excursion
- (set-buffer standard-output)
- ;; Return the text we displayed.
- (buffer-string)))))))
+\f
+;; Key bindings
(defun describe-bindings (&optional prefix buffer)
"Show a list of all defined keys, and their definitions.
The optional argument PREFIX, if non-nil, should be a key sequence;
then we display only bindings that start with that prefix.
The optional argument BUFFER specifies which buffer's bindings
-to display (default, the current buffer)."
- (interactive "P")
+to display (default, the current buffer). BUFFER can be a buffer
+or a buffer name."
+ (interactive)
(or buffer (setq buffer (current-buffer)))
+ (help-setup-xref (list #'describe-bindings prefix buffer) (interactive-p))
(with-current-buffer buffer
- (describe-bindings-internal nil prefix))
- (with-current-buffer "*Help*"
- (help-setup-xref (list #'describe-bindings prefix buffer)
- (interactive-p))))
+ (describe-bindings-internal nil prefix)))
+
+;; This function used to be in keymap.c.
+(defun describe-bindings-internal (&optional menus prefix)
+ "Show a list of all defined keys, and their definitions.
+We put that list in a buffer, and display the buffer.
+
+The optional argument MENUS, if non-nil, says to mention menu bindings.
+\(Ordinarily these are omitted from the output.)
+The optional argument PREFIX, if non-nil, should be a key sequence;
+then we display only bindings that start with that prefix."
+ (interactive)
+ (let ((buf (current-buffer)))
+ (with-output-to-temp-buffer "*Help*"
+ (with-current-buffer standard-output
+ (describe-buffer-bindings buf prefix menus)))))
(defun where-is (definition &optional insert)
"Print message listing key sequences that invoke the command DEFINITION.
If INSERT (the prefix arg) is non-nil, insert the message in the buffer."
(interactive
(let ((fn (function-called-at-point))
- (enable-recursive-minibuffers t)
+ (enable-recursive-minibuffers t)
val)
- (setq val (completing-read (if fn
- (format "Where is command (default %s): " fn)
- "Where is command: ")
- obarray 'commandp t))
- (list (if (equal val "")
- fn (intern val))
- current-prefix-arg)))
- (let* ((keys (where-is-internal definition overriding-local-map nil nil))
- (keys1 (mapconcat 'key-description keys ", "))
- (standard-output (if insert (current-buffer) t)))
- (if insert
- (if (> (length keys1) 0)
- (princ (format "%s (%s)" keys1 definition))
- (princ (format "M-x %s RET" definition)))
- (if (> (length keys1) 0)
- (princ (format "%s is on %s" definition keys1))
- (princ (format "%s is not on any key" definition)))))
+ (setq val (completing-read
+ (if fn
+ (format "Where is command (default %s): " fn)
+ "Where is command: ")
+ obarray 'commandp t))
+ (list (if (equal val "") fn (intern val)) current-prefix-arg)))
+ (let ((func (indirect-function definition))
+ (defs nil)
+ (standard-output (if insert (current-buffer) t)))
+ ;; In DEFS, find all symbols that are aliases for DEFINITION.
+ (mapatoms (lambda (symbol)
+ (and (fboundp symbol)
+ (not (eq symbol definition))
+ (eq func (condition-case ()
+ (indirect-function symbol)
+ (error symbol)))
+ (push symbol defs))))
+ ;; Look at all the symbols--first DEFINITION,
+ ;; then its aliases.
+ (dolist (symbol (cons definition defs))
+ (let* ((remapped (command-remapping symbol))
+ (keys (where-is-internal
+ symbol overriding-local-map nil nil remapped))
+ (keys (mapconcat 'key-description keys ", "))
+ string)
+ (setq string
+ (if insert
+ (if (> (length keys) 0)
+ (if remapped
+ (format "%s (%s) (remapped from %s)"
+ keys remapped symbol)
+ (format "%s (%s)" keys symbol))
+ (format "M-x %s RET" symbol))
+ (if (> (length keys) 0)
+ (if remapped
+ (format "%s is remapped to %s which is on %s"
+ symbol remapped keys)
+ (format "%s is on %s" symbol keys))
+ ;; If this is the command the user asked about,
+ ;; and it is not on any key, say so.
+ ;; For other symbols, its aliases, say nothing
+ ;; about them unless they are on keys.
+ (if (eq symbol definition)
+ (format "%s is not on any key" symbol)))))
+ (when string
+ (unless (eq symbol definition)
+ (princ ";\n its alias "))
+ (princ string)))))
nil)
-(defun locate-library (library &optional nosuffix path interactive-call)
- "Show the precise file name of Emacs library LIBRARY.
-This command searches the directories in `load-path' like `M-x load-library'
-to find the file that `M-x load-library RET LIBRARY RET' would load.
-Optional second arg NOSUFFIX non-nil means don't add suffixes `.elc' or `.el'
-to the specified name LIBRARY.
-
-If the optional third arg PATH is specified, that list of directories
-is used instead of `load-path'.
-
-When called from a program, the file name is normaly returned as a
-string. When run interactively, the argument INTERACTIVE-CALL is t,
-and the file name is displayed in the echo area."
- (interactive (list (read-string "Locate library: ")
- nil nil
- t))
- (let (result)
- (catch 'answer
- (mapc
- (lambda (dir)
- (mapc
- (lambda (suf)
- (let ((try (expand-file-name (concat library suf) dir)))
- (and (file-readable-p try)
- (null (file-directory-p try))
- (progn
- (setq result try)
- (throw 'answer try)))))
- (if nosuffix
- '("")
- '(".elc" ".el" "")
-;;; load doesn't handle this yet.
-;;; (let ((basic '(".elc" ".el" ""))
-;;; (compressed '(".Z" ".gz" "")))
-;;; ;; If autocompression mode is on,
-;;; ;; consider all combinations of library suffixes
-;;; ;; and compression suffixes.
-;;; (if (rassq 'jka-compr-handler file-name-handler-alist)
-;;; (apply 'nconc
-;;; (mapcar (lambda (compelt)
-;;; (mapcar (lambda (baselt)
-;;; (concat baselt compelt))
-;;; basic))
-;;; compressed))
-;;; basic))
- )))
- (or path load-path)))
- (and interactive-call
- (if result
- (message "Library is file %s" result)
- (message "No library %s in search path" library)))
- result))
+(defun string-key-binding (key)
+ "Value is the binding of KEY in a string.
+If KEY is an event on a string, and that string has a `local-map'
+or `keymap' property, return the binding of KEY in the string's keymap."
+ (let* ((defn nil)
+ (start (when (vectorp key)
+ (if (memq (aref key 0)
+ '(mode-line header-line left-margin right-margin))
+ (event-start (aref key 1))
+ (and (consp (aref key 0))
+ (event-start (aref key 0))))))
+ (string-info (and (consp start) (nth 4 start))))
+ (when string-info
+ (let* ((string (car string-info))
+ (pos (cdr string-info))
+ (local-map (and (>= pos 0)
+ (< pos (length string))
+ (or (get-text-property pos 'local-map string)
+ (get-text-property pos 'keymap string)))))
+ (setq defn (and local-map (lookup-key local-map key)))))
+ defn))
-\f
-;;; Grokking cross-reference information in doc strings and
-;;; hyperlinking it.
-
-;; This may have some scope for extension and the same or something
-;; similar should be done for widget doc strings, which currently use
-;; another mechanism.
-
-(defcustom help-highlight-p t
- "*If non-nil, `help-make-xrefs' highlight cross-references.
-Under a window system it highlights them with face defined by
-`help-highlight-face'."
- :group 'help
- :version "20.3"
- :type 'boolean)
-
-(defcustom help-highlight-face 'underline
- "Face used by `help-make-xrefs' to highlight cross-references.
-Must be previously-defined."
- :group 'help
- :version "20.3"
- :type 'face)
-
-(defvar help-back-label (purecopy "[back]")
- "Label to use by `help-make-xrefs' for the go-back reference.")
-
-(defconst help-xref-symbol-regexp
- (purecopy (concat "\\(\\<\\(\\(variable\\|option\\)\\|"
- "\\(function\\|command\\)\\|"
- "\\(face\\)\\|"
- "\\(symbol\\)\\)\\s-+\\)?"
- ;; Note starting with word-syntax character:
- "`\\(\\sw\\(\\sw\\|\\s_\\)+\\)'"))
- "Regexp matching doc string references to symbols.
-
-The words preceding the quoted symbol can be used in doc strings to
-distinguish references to variables, functions and symbols.")
-
-(defconst help-xref-mule-regexp nil
- "Regexp matching doc string references to MULE-related keywords.
-
-It is usually nil, and is temporarily bound to an appropriate regexp
-when help commands related to multilingual environment (e.g.,
-`describe-coding-system') are invoked.")
-
-
-(defconst help-xref-info-regexp
- (purecopy "\\<[Ii]nfo[ \t\n]+node[ \t\n]+`\\([^']+\\)'")
- "Regexp matching doc string references to an Info node.")
-
-(defun help-setup-xref (item interactive-p)
- "Invoked from commands using the \"*Help*\" buffer to install some xref info.
-
-ITEM is a (FUNCTION . ARGS) pair appropriate for recreating the help
-buffer after following a reference. INTERACTIVE-P is non-nil if the
-calling command was invoked interactively. In this case the stack of
-items for help buffer \"back\" buttons is cleared."
- (if interactive-p
- (setq help-xref-stack nil))
- (setq help-xref-stack-item item))
-
-(defvar help-xref-following nil
- "Non-nil when following a help cross-reference.")
-
-(defun help-make-xrefs (&optional buffer)
- "Parse and hyperlink documentation cross-references in the given BUFFER.
-
-Find cross-reference information in a buffer and, if
-`help-highlight-p' is non-nil, highlight it with face defined by
-`help-highlight-face'; activate such cross references for selection
-with `help-follow'. Cross-references have the canonical form `...'
-and the type of reference may be disambiguated by the preceding
-word(s) used in `help-xref-symbol-regexp'.
-
-If the variable `help-xref-mule-regexp' is non-nil, find also
-cross-reference information related to multilingual environment
-\(e.g., coding-systems). This variable is also used to disambiguate
-the type of reference as the same way as `help-xref-symbol-regexp'.
-
-A special reference `back' is made to return back through a stack of
-help buffers. Variable `help-back-label' specifies the text for
-that."
- (interactive "b")
+(defun help-key-description (key untranslated)
+ (let ((string (key-description key)))
+ (if (or (not untranslated)
+ (and (eq (aref untranslated 0) ?\e) (not (eq (aref key 0) ?\e))))
+ string
+ (let ((otherstring (key-description untranslated)))
+ (if (equal string otherstring)
+ string
+ (format "%s (translated from %s)" string otherstring))))))
+
+(defun describe-key-briefly (&optional key insert untranslated)
+ "Print the name of the function KEY invokes. KEY is a string.
+If INSERT (the prefix arg) is non-nil, insert the message in the buffer.
+If non-nil, UNTRANSLATED is a vector of the untranslated events.
+It can also be a number in which case the untranslated events from
+the last key hit are used.
+
+If KEY is a menu item or a tool-bar button that is disabled, this command
+temporarily enables it to allow getting help on disabled items and buttons."
+ (interactive
+ (let ((enable-disabled-menus-and-buttons t)
+ (cursor-in-echo-area t)
+ saved-yank-menu)
+ (unwind-protect
+ (let (key)
+ ;; If yank-menu is empty, populate it temporarily, so that
+ ;; "Select and Paste" menu can generate a complete event.
+ (when (null (cdr yank-menu))
+ (setq saved-yank-menu (copy-sequence yank-menu))
+ (menu-bar-update-yank-menu "(any string)" nil))
+ (setq key (read-key-sequence "Describe key (or click or menu item): "))
+ ;; If KEY is a down-event, read and discard the
+ ;; corresponding up-event.
+ (if (and (vectorp key)
+ (eventp (elt key 0))
+ (memq 'down (event-modifiers (elt key 0))))
+ (read-event))
+ (list
+ key
+ (if current-prefix-arg (prefix-numeric-value current-prefix-arg))
+ 1))
+ ;; Put yank-menu back as it was, if we changed it.
+ (when saved-yank-menu
+ (setq yank-menu (copy-sequence saved-yank-menu))
+ (fset 'yank-menu (cons 'keymap yank-menu))))))
+ (if (numberp untranslated)
+ (setq untranslated (this-single-command-raw-keys)))
(save-excursion
- (set-buffer (or buffer (current-buffer)))
- (goto-char (point-min))
- ;; Skip the header-type info, though it might be useful to parse
- ;; it at some stage (e.g. "function in `library'").
- (forward-paragraph)
- (let ((old-modified (buffer-modified-p)))
- (let ((stab (syntax-table))
- (case-fold-search t)
- (inhibit-read-only t))
- (set-syntax-table emacs-lisp-mode-syntax-table)
- ;; The following should probably be abstracted out.
- (unwind-protect
- (progn
- ;; Info references
- (save-excursion
- (while (re-search-forward help-xref-info-regexp nil t)
- (let ((data (match-string 1)))
- (save-match-data
- (unless (string-match "^([^)]+)" data)
- (setq data (concat "(emacs)" data))))
- (help-xref-button 1 #'info data
- "mouse-2, RET: read this Info node"))))
- ;; Mule related keywords. Do this before trying
- ;; `help-xref-symbol-regexp' because some of Mule
- ;; keywords have variable or function definitions.
- (if help-xref-mule-regexp
- (save-excursion
- (while (re-search-forward help-xref-mule-regexp nil t)
- (let* ((data (match-string 7))
- (sym (intern-soft data)))
- (cond
- ((match-string 3) ; coding system
- (and sym (coding-system-p sym)
- (help-xref-button
- 7 #'describe-coding-system sym
- "mouse-2, RET: describe this coding system")))
- ((match-string 4) ; input method
- (and (assoc data input-method-alist)
- (help-xref-button
- 7 #'describe-input-method data
- "mouse-2, RET: describe this input method")))
- ((or (match-string 5) (match-string 6)) ; charset
- (and sym (charsetp sym)
- (help-xref-button
- 7 #'describe-character-set sym
- "mouse-2, RET: describe this character set")))
- ((assoc data input-method-alist)
- (help-xref-button
- 7 #'describe-input-method data
- "mouse-2, RET: describe this input method"))
- ((and sym (coding-system-p sym))
- (help-xref-button
- 7 #'describe-coding-system sym
- "mouse-2, RET: describe this coding system"))
- ((and sym (charsetp sym))
- (help-xref-button
- 7 #'describe-character-set sym
- "mouse-2, RET: describe this character set")))))))
- ;; Quoted symbols
- (save-excursion
- (while (re-search-forward help-xref-symbol-regexp nil t)
- (let* ((data (match-string 7))
- (sym (intern-soft data)))
- (if sym
- (cond
- ((match-string 3) ; `variable' &c
- (and (boundp sym) ; `variable' doesn't ensure
- ; it's actually bound
- (help-xref-button
- 7 #'describe-variable sym
- "mouse-2, RET: describe this variable")))
- ((match-string 4) ; `function' &c
- (and (fboundp sym) ; similarly
- (help-xref-button
- 7 #'describe-function sym
- "mouse-2, RET: describe this function")))
- ((match-string 5) ; `face'
- (and (facep sym)
- (help-xref-button 7 #'describe-face sym
- "mouse-2, RET: describe this face")))
- ((match-string 6)) ; nothing for symbol
- ((and (boundp sym) (fboundp sym))
- ;; We can't intuit whether to use the
- ;; variable or function doc -- supply both.
- (help-xref-button
- 7 #'help-xref-interned sym
- "mouse-2, RET: describe this symbol"))
- ((boundp sym)
- (help-xref-button
- 7 #'describe-variable sym
- "mouse-2, RET: describe this variable"))
- ((fboundp sym)
- (help-xref-button
- 7 #'describe-function sym
- "mouse-2, RET: describe this function"))
- ((facep sym)
- (help-xref-button
- 7 #'describe-face sym)))))))
- ;; An obvious case of a key substitution:
- (save-excursion
- (while (re-search-forward
- ;; Assume command name is only word characters
- ;; and dashes to get things like `use M-x foo.'.
- "\\<M-x\\s-+\\(\\sw\\(\\sw\\|-\\)+\\)" nil t)
- (let ((sym (intern-soft (match-string 1))))
- (if (fboundp sym)
- (help-xref-button
- 1 #'describe-function sym
- "mouse-2, RET: describe this command")))))
- ;; Look for commands in whole keymap substitutions:
- (save-excursion
- ;; Make sure to find the first keymap.
- (goto-char (point-min))
- ;; Find a header and the column at which the command
- ;; name will be found.
- (while (re-search-forward "^key +binding\n\\(-+ +\\)-+\n\n"
- nil t)
- (let ((col (- (match-end 1) (match-beginning 1))))
- (while
- ;; Ignore single blank lines in table, but not
- ;; double ones, which should terminate it.
- (and (not (looking-at "\n\\s-*\n"))
- (progn
- (and (eolp) (forward-line))
- (end-of-line)
- (skip-chars-backward "^\t\n")
- (if (and (>= (current-column) col)
- (looking-at "\\(\\sw\\|-\\)+$"))
- (let ((sym (intern-soft (match-string 0))))
- (if (fboundp sym)
- (help-xref-button
- 0 #'describe-function sym
- "mouse-2, RET: describe this function"))))
- (zerop (forward-line)))))))))
- (set-syntax-table stab))
- ;; Delete extraneous newlines at the end of the docstring
- (goto-char (point-max))
- (while (and (not (bobp)) (bolp))
- (delete-char -1))
- ;; Make a back-reference in this buffer if appropriate.
- (when (and help-xref-following help-xref-stack)
- (save-excursion
- (insert "\n\n" help-back-label))
- ;; Just to provide the match data:
- (looking-at (concat "\n\n\\(" (regexp-quote help-back-label) "\\)"))
- (help-xref-button 1 #'help-xref-go-back (current-buffer))))
- ;; View mode steals RET from us.
- (set (make-local-variable 'minor-mode-overriding-map-alist)
- (list (cons 'view-mode
- (let ((map (make-sparse-keymap)))
- (set-keymap-parent map view-mode-map)
- (define-key map "\r" 'help-follow)
- map))))
- (set-buffer-modified-p old-modified))))
-
-(defun help-xref-button (match-number function data &optional help-echo)
- "Make a hyperlink for cross-reference text previously matched.
-
-MATCH-NUMBER is the subexpression of interest in the last matched
-regexp. FUNCTION is a function to invoke when the button is
-activated, applied to DATA. DATA may be a single value or a list.
-See `help-make-xrefs'.
-If optional arg HELP-ECHO is supplied, it is used as a help string."
- ;; Don't mung properties we've added specially in some instances.
- (unless (get-text-property (match-beginning match-number) 'help-xref)
- (add-text-properties (match-beginning match-number)
- (match-end match-number)
- (list 'mouse-face 'highlight
- 'help-xref (cons function
- (if (listp data)
- data
- (list data)))))
- (if help-echo
- (put-text-property (match-beginning match-number)
- (match-end match-number)
- 'help-echo help-echo))
- (if help-highlight-p
- (put-text-property (match-beginning match-number)
- (match-end match-number)
- 'face help-highlight-face))))
-
-(defun help-insert-xref-button (string function data &optional help-echo)
- "Insert STRING and make a hyperlink from cross-reference text on it.
-
-FUNCTION is a function to invoke when the button is activated, applied
-to DATA. DATA may be a single value or a list. See `help-make-xrefs'.
-If optional arg HELP-ECHO is supplied, it is used as a help string."
- (let ((pos (point)))
- (insert string)
- (goto-char pos)
- (search-forward string)
- (help-xref-button 0 function data help-echo)))
+ (let ((modifiers (event-modifiers (aref key 0)))
+ (standard-output (if insert (current-buffer) t))
+ window position)
+ ;; For a mouse button event, go to the button it applies to
+ ;; to get the right key bindings. And go to the right place
+ ;; in case the keymap depends on where you clicked.
+ (if (or (memq 'click modifiers) (memq 'down modifiers)
+ (memq 'drag modifiers))
+ (setq window (posn-window (event-start (aref key 0)))
+ position (posn-point (event-start (aref key 0)))))
+ (if (windowp window)
+ (progn
+ (set-buffer (window-buffer window))
+ (goto-char position)))
+ ;; Ok, now look up the key and name the command.
+ (let ((defn (or (string-key-binding key)
+ (key-binding key t)))
+ key-desc)
+ ;; Handle the case where we faked an entry in "Select and Paste" menu.
+ (if (and (eq defn nil)
+ (stringp (aref key (1- (length key))))
+ (eq (key-binding (substring key 0 -1)) 'yank-menu))
+ (setq defn 'menu-bar-select-yank))
+ ;; Don't bother user with strings from (e.g.) the select-paste menu.
+ (if (stringp (aref key (1- (length key))))
+ (aset key (1- (length key)) "(any string)"))
+ (if (and (> (length untranslated) 0)
+ (stringp (aref untranslated (1- (length untranslated)))))
+ (aset untranslated (1- (length untranslated))
+ "(any string)"))
+ ;; Now describe the key, perhaps as changed.
+ (setq key-desc (help-key-description key untranslated))
+ (if (or (null defn) (integerp defn) (equal defn 'undefined))
+ (princ (format "%s is undefined" key-desc))
+ (princ (format (if (windowp window)
+ "%s at that spot runs the command %s"
+ "%s runs the command %s")
+ key-desc
+ (if (symbolp defn) defn (prin1-to-string defn)))))))))
+(defun describe-key (&optional key untranslated up-event)
+ "Display documentation of the function invoked by KEY.
+KEY can be any kind of a key sequence; it can include keyboard events,
+mouse events, and/or menu events. When calling from a program,
+pass KEY as a string or a vector.
-\f
-;; Additional functions for (re-)creating types of help buffers.
-(defun help-xref-interned (symbol)
- "Follow a hyperlink which appeared to be an arbitrary interned SYMBOL.
-
-Both variable and function documentation are extracted into a single
-help buffer."
- (let ((fdoc (when (fboundp symbol) (describe-function symbol)))
- (facedoc (when (facep symbol) (describe-face symbol))))
- (when (or (boundp symbol) (not fdoc))
- (describe-variable symbol)
- ;; We now have a help buffer on the variable. Insert the function
- ;; text before it.
- (when (or fdoc facedoc)
- (with-current-buffer "*Help*"
- (goto-char (point-min))
- (let ((inhibit-read-only t))
- (when fdoc
- (insert fdoc "\n\n"))
- (when facedoc
- (insert (make-string 30 ?-) "\n\n" (symbol-name symbol)
- " is also a " "face." "\n\n" facedoc "\n\n"))
- (insert (make-string 30 ?-) "\n\n" (symbol-name symbol)
- " is also a " "variable." "\n\n"))
- (help-setup-xref (list #'help-xref-interned symbol) nil))))))
-
-(defun help-xref-mode (buffer)
- "Do a `describe-mode' for the specified BUFFER."
+If non-nil, UNTRANSLATED is a vector of the corresponding untranslated events.
+It can also be a number, in which case the untranslated events from
+the last key sequence entered are used.
+UP-EVENT is the up-event that was discarded by reading KEY, or nil.
+
+If KEY is a menu item or a tool-bar button that is disabled, this command
+temporarily enables it to allow getting help on disabled items and buttons."
+ (interactive
+ (let ((enable-disabled-menus-and-buttons t)
+ (cursor-in-echo-area t)
+ saved-yank-menu)
+ (unwind-protect
+ (let (key)
+ ;; If yank-menu is empty, populate it temporarily, so that
+ ;; "Select and Paste" menu can generate a complete event.
+ (when (null (cdr yank-menu))
+ (setq saved-yank-menu (copy-sequence yank-menu))
+ (menu-bar-update-yank-menu "(any string)" nil))
+ (setq key (read-key-sequence "Describe key (or click or menu item): "))
+ (list
+ key
+ (prefix-numeric-value current-prefix-arg)
+ ;; If KEY is a down-event, read the corresponding up-event
+ ;; and use it as the third argument.
+ (if (and (vectorp key)
+ (eventp (elt key 0))
+ (memq 'down (event-modifiers (elt key 0))))
+ (read-event))))
+ ;; Put yank-menu back as it was, if we changed it.
+ (when saved-yank-menu
+ (setq yank-menu (copy-sequence saved-yank-menu))
+ (fset 'yank-menu (cons 'keymap yank-menu))))))
+ (if (numberp untranslated)
+ (setq untranslated (this-single-command-raw-keys)))
(save-excursion
- (set-buffer buffer)
- (describe-mode)))
+ (let ((modifiers (event-modifiers (aref key 0)))
+ window position)
+ ;; For a mouse button event, go to the button it applies to
+ ;; to get the right key bindings. And go to the right place
+ ;; in case the keymap depends on where you clicked.
+ (if (or (memq 'click modifiers) (memq 'down modifiers)
+ (memq 'drag modifiers))
+ (setq window (posn-window (event-start (aref key 0)))
+ position (posn-point (event-start (aref key 0)))))
+ (when (windowp window)
+ (set-buffer (window-buffer window))
+ (goto-char position))
+ (let ((defn (or (string-key-binding key) (key-binding key t))))
+ ;; Handle the case where we faked an entry in "Select and Paste" menu.
+ (if (and (eq defn nil)
+ (stringp (aref key (1- (length key))))
+ (eq (key-binding (substring key 0 -1)) 'yank-menu))
+ (setq defn 'menu-bar-select-yank))
+ (if (or (null defn) (integerp defn) (equal defn 'undefined))
+ (message "%s is undefined" (help-key-description key untranslated))
+ (help-setup-xref (list #'describe-function defn) (interactive-p))
+ ;; Don't bother user with strings from (e.g.) the select-paste menu.
+ (if (stringp (aref key (1- (length key))))
+ (aset key (1- (length key)) "(any string)"))
+ (if (and untranslated
+ (stringp (aref untranslated (1- (length untranslated)))))
+ (aset untranslated (1- (length untranslated))
+ "(any string)"))
+ (with-output-to-temp-buffer (help-buffer)
+ (princ (help-key-description key untranslated))
+ (if (windowp window)
+ (princ " at that spot"))
+ (princ " runs the command ")
+ (prin1 defn)
+ (princ "\n which is ")
+ (describe-function-1 defn)
+ (when up-event
+ (let ((type (event-basic-type up-event))
+ (hdr "\n\n-------------- up event ---------------\n\n")
+ defn sequence
+ mouse-1-tricky mouse-1-remapped)
+ (setq sequence (vector up-event))
+ (when (and (eq type 'mouse-1)
+ (windowp window)
+ mouse-1-click-follows-link
+ (not (eq mouse-1-click-follows-link 'double))
+ (setq mouse-1-remapped
+ (with-current-buffer (window-buffer window)
+ (mouse-on-link-p (posn-point
+ (event-start up-event))))))
+ (setq mouse-1-tricky (and (integerp mouse-1-click-follows-link)
+ (> mouse-1-click-follows-link 0)))
+ (cond ((stringp mouse-1-remapped)
+ (setq sequence mouse-1-remapped))
+ ((vectorp mouse-1-remapped)
+ (setcar up-event (elt mouse-1-remapped 0)))
+ (t (setcar up-event 'mouse-2))))
+ (setq defn (or (string-key-binding sequence)
+ (key-binding sequence)))
+ (unless (or (null defn) (integerp defn) (equal defn 'undefined))
+ (princ (if mouse-1-tricky
+ "\n\n----------------- up-event (short click) ----------------\n\n"
+ hdr))
+ (setq hdr nil)
+ (princ (symbol-name type))
+ (if (windowp window)
+ (princ " at that spot"))
+ (if mouse-1-remapped
+ (princ " is remapped to <mouse-2>\n which" ))
+ (princ " runs the command ")
+ (prin1 defn)
+ (princ "\n which is ")
+ (describe-function-1 defn))
+ (when mouse-1-tricky
+ (setcar up-event 'mouse-1)
+ (setq defn (or (string-key-binding (vector up-event))
+ (key-binding (vector up-event))))
+ (unless (or (null defn) (integerp defn) (eq defn 'undefined))
+ (princ (or hdr
+ "\n\n----------------- up-event (long click) ----------------\n\n"))
+ (princ "Pressing mouse-1")
+ (if (windowp window)
+ (princ " at that spot"))
+ (princ (format " for longer than %d milli-seconds\n"
+ mouse-1-click-follows-link))
+ (princ " runs the command ")
+ (prin1 defn)
+ (princ "\n which is ")
+ (describe-function-1 defn)))))
+ (print-help-return-message)))))))
\f
-;;; Navigation/hyperlinking with xrefs
-
-(defun help-follow-mouse (click)
- "Follow the cross-reference that you click on."
- (interactive "e")
- (let* ((start (event-start click))
- (window (car start))
- (pos (car (cdr start))))
- (with-current-buffer (window-buffer window)
- (help-follow pos))))
-
-(defun help-xref-go-back (buffer)
- "From BUFFER, go back to previous help buffer text using `help-xref-stack'."
- (let (item position method args)
- (with-current-buffer buffer
- (when help-xref-stack
- (setq help-xref-stack (cdr help-xref-stack)) ; due to help-follow
- (setq item (pop help-xref-stack)
- position (car item)
- method (cadr item)
- args (cddr item))))
- (apply method args)
- ;; We assume that the buffer we just recreated has the saved name,
- ;; which might not always be true.
- (when (get-buffer (cdr position))
- (with-current-buffer (cdr position)
- (goto-char (car position))))))
-
-(defun help-go-back ()
- "Invoke the [back] button (if any) in the Help mode buffer."
- (interactive)
- (help-follow (1- (point-max))))
-
-(defun help-follow (&optional pos)
- "Follow cross-reference at POS, defaulting to point.
-
-For the cross-reference format, see `help-make-xrefs'."
- (interactive "d")
- (unless pos
- (setq pos (point)))
- (let* ((help-data
- (or (and (not (= pos (point-max)))
- (get-text-property pos 'help-xref))
- (and (not (= pos (point-min)))
- (get-text-property (1- pos) 'help-xref))
- ;; check if the symbol under point is a function or variable
- (let ((sym
- (intern
- (save-excursion
- (goto-char pos) (skip-syntax-backward "w_")
- (buffer-substring (point)
- (progn (skip-syntax-forward "w_")
- (point)))))))
- (when (or (boundp sym) (fboundp sym))
- (list #'help-xref-interned sym)))))
- (method (car help-data))
- (args (cdr help-data)))
- (when help-data
- (setq help-xref-stack (cons (cons (cons pos (buffer-name))
- help-xref-stack-item)
- help-xref-stack))
- (setq help-xref-stack-item nil)
- ;; There is a reference at point. Follow it.
- (let ((help-xref-following t))
- (apply method args)))))
-
-;; For tabbing through buffer.
-(defun help-next-ref ()
- "Find the next help cross-reference in the buffer."
- (interactive)
- (let (pos)
- (while (not pos)
- (if (get-text-property (point) 'help-xref) ; move off reference
- (goto-char (or (next-single-property-change (point) 'help-xref)
- (point))))
- (cond ((setq pos (next-single-property-change (point) 'help-xref))
- (if pos (goto-char pos)))
- ((bobp)
- (message "No cross references in the buffer.")
- (setq pos t))
- (t ; be circular
- (goto-char (point-min)))))))
-
-(defun help-previous-ref ()
- "Find the previous help cross-reference in the buffer."
+(defun describe-mode (&optional buffer)
+ "Display documentation of current major mode and minor modes.
+A brief summary of the minor modes comes first, followed by the
+major mode description. This is followed by detailed
+descriptions of the minor modes, each on a separate page.
+
+For this to work correctly for a minor mode, the mode's indicator
+variable \(listed in `minor-mode-alist') must also be a function
+whose documentation describes the minor mode."
(interactive)
- (let (pos)
- (while (not pos)
- (if (get-text-property (point) 'help-xref) ; move off reference
- (goto-char (or (previous-single-property-change (point) 'help-xref)
- (point))))
- (cond ((setq pos (previous-single-property-change (point) 'help-xref))
- (if pos (goto-char pos)))
- ((bobp)
- (message "No cross references in the buffer.")
- (setq pos t))
- (t ; be circular
- (goto-char (point-max)))))))
+ (unless buffer (setq buffer (current-buffer)))
+ (help-setup-xref (list #'describe-mode buffer)
+ (interactive-p))
+ ;; For the sake of help-do-xref and help-xref-go-back,
+ ;; don't switch buffers before calling `help-buffer'.
+ (with-output-to-temp-buffer (help-buffer)
+ (with-current-buffer buffer
+ (let (minor-modes)
+ ;; Older packages do not register in minor-mode-list but only in
+ ;; minor-mode-alist.
+ (dolist (x minor-mode-alist)
+ (setq x (car x))
+ (unless (memq x minor-mode-list)
+ (push x minor-mode-list)))
+ ;; Find enabled minor mode we will want to mention.
+ (dolist (mode minor-mode-list)
+ ;; Document a minor mode if it is listed in minor-mode-alist,
+ ;; non-nil, and has a function definition.
+ (let ((fmode (or (get mode :minor-mode-function) mode)))
+ (and (boundp mode) (symbol-value mode)
+ (fboundp fmode)
+ (let ((pretty-minor-mode
+ (if (string-match "\\(\\(-minor\\)?-mode\\)?\\'"
+ (symbol-name fmode))
+ (capitalize
+ (substring (symbol-name fmode)
+ 0 (match-beginning 0)))
+ fmode)))
+ (push (list fmode pretty-minor-mode
+ (format-mode-line (assq mode minor-mode-alist)))
+ minor-modes)))))
+ (setq minor-modes
+ (sort minor-modes
+ (lambda (a b) (string-lessp (cadr a) (cadr b)))))
+ (when minor-modes
+ (princ "Summary of minor modes:\n")
+ (make-local-variable 'help-button-cache)
+ (with-current-buffer standard-output
+ (dolist (mode minor-modes)
+ (let ((mode-function (nth 0 mode))
+ (pretty-minor-mode (nth 1 mode))
+ (indicator (nth 2 mode)))
+ (setq indicator (if (zerop (length indicator))
+ "no indicator"
+ (format "indicator%s" indicator)))
+ (add-text-properties 0 (length pretty-minor-mode)
+ '(face bold) pretty-minor-mode)
+ (save-excursion
+ (goto-char (point-max))
+ (princ "\n\f\n")
+ (push (point-marker) help-button-cache)
+ ;; Document the minor modes fully.
+ (insert pretty-minor-mode)
+ (princ (format " minor mode (%s):\n" indicator))
+ (princ (documentation mode-function)))
+ (princ " ")
+ (insert-button pretty-minor-mode
+ 'action (car help-button-cache)
+ 'follow-link t
+ 'help-echo "mouse-2, RET: show full information")
+ (princ (format " minor mode (%s):\n" indicator)))))
+ (princ "\n(Full information about these minor modes
+follows the description of the major mode.)\n\n"))
+ ;; Document the major mode.
+ (let ((mode mode-name))
+ (with-current-buffer standard-output
+ (let ((start (point)))
+ (insert (format-mode-line mode))
+ (add-text-properties start (point) '(face bold)))))
+ (princ " mode:\n")
+ (princ (documentation major-mode)))
+ (print-help-return-message))))
+
+
+(defun describe-minor-mode (minor-mode)
+ "Display documentation of a minor mode given as MINOR-MODE.
+MINOR-MODE can be a minor mode symbol or a minor mode indicator string
+appeared on the mode-line."
+ (interactive (list (completing-read
+ "Minor mode: "
+ (nconc
+ (describe-minor-mode-completion-table-for-symbol)
+ (describe-minor-mode-completion-table-for-indicator)
+ ))))
+ (if (symbolp minor-mode)
+ (setq minor-mode (symbol-name minor-mode)))
+ (let ((symbols (describe-minor-mode-completion-table-for-symbol))
+ (indicators (describe-minor-mode-completion-table-for-indicator)))
+ (cond
+ ((member minor-mode symbols)
+ (describe-minor-mode-from-symbol (intern minor-mode)))
+ ((member minor-mode indicators)
+ (describe-minor-mode-from-indicator minor-mode))
+ (t
+ (error "No such minor mode: %s" minor-mode)))))
+
+;; symbol
+(defun describe-minor-mode-completion-table-for-symbol ()
+ ;; In order to list up all minor modes, minor-mode-list
+ ;; is used here instead of minor-mode-alist.
+ (delq nil (mapcar 'symbol-name minor-mode-list)))
+(defun describe-minor-mode-from-symbol (symbol)
+ "Display documentation of a minor mode given as a symbol, SYMBOL"
+ (interactive (list (intern (completing-read
+ "Minor mode symbol: "
+ (describe-minor-mode-completion-table-for-symbol)))))
+ (if (fboundp symbol)
+ (describe-function symbol)
+ (describe-variable symbol)))
+
+;; indicator
+(defun describe-minor-mode-completion-table-for-indicator ()
+ (delq nil
+ (mapcar (lambda (x)
+ (let ((i (format-mode-line x)))
+ ;; remove first space if existed
+ (cond
+ ((= 0 (length i))
+ nil)
+ ((eq (aref i 0) ?\ )
+ (substring i 1))
+ (t
+ i))))
+ minor-mode-alist)))
+(defun describe-minor-mode-from-indicator (indicator)
+ "Display documentation of a minor mode specified by INDICATOR.
+If you call this function interactively, you can give indicator which
+is currently activated with completion."
+ (interactive (list
+ (completing-read
+ "Minor mode indicator: "
+ (describe-minor-mode-completion-table-for-indicator))))
+ (let ((minor-mode (lookup-minor-mode-from-indicator indicator)))
+ (if minor-mode
+ (describe-minor-mode-from-symbol minor-mode)
+ (error "Cannot find minor mode for `%s'" indicator))))
+
+(defun lookup-minor-mode-from-indicator (indicator)
+ "Return a minor mode symbol from its indicator on the modeline."
+ ;; remove first space if existed
+ (if (and (< 0 (length indicator))
+ (eq (aref indicator 0) ?\ ))
+ (setq indicator (substring indicator 1)))
+ (let ((minor-modes minor-mode-alist)
+ result)
+ (while minor-modes
+ (let* ((minor-mode (car (car minor-modes)))
+ (anindicator (format-mode-line
+ (car (cdr (car minor-modes))))))
+ ;; remove first space if existed
+ (if (and (stringp anindicator)
+ (> (length anindicator) 0)
+ (eq (aref anindicator 0) ?\ ))
+ (setq anindicator (substring anindicator 1)))
+ (if (equal indicator anindicator)
+ (setq result minor-mode
+ minor-modes nil)
+ (setq minor-modes (cdr minor-modes)))))
+ result))
\f
;;; Automatic resizing of temporary buffers.
(defcustom temp-buffer-max-height (lambda (buffer) (/ (- (frame-height) 2) 2))
- "*Maximum height of a window displaying a temporary buffer.
-This is the maximum height (in text lines) which `resize-temp-buffer-window'
+ "Maximum height of a window displaying a temporary buffer.
+This is effective only when Temp Buffer Resize mode is enabled.
+The value is the maximum height (in lines) which `resize-temp-buffer-window'
will give to a window displaying a temporary buffer.
-It can also be a function which will be called with the object corresponding
-to the buffer to be displayed as argument and should return an integer
-positive number."
+It can also be a function to be called to choose the height for such a buffer.
+It gets one argumemt, the buffer, and should return a positive integer."
:type '(choice integer function)
:group 'help
:version "20.4")
This makes the window the right height for its contents, but never
more than `temp-buffer-max-height' nor less than `window-min-height'.
This applies to `help', `apropos' and `completion' buffers, and some others."
- nil nil nil :global t :group 'help
+ :global t :group 'help
(if temp-buffer-resize-mode
- ;; `help-mode-maybe' may add a `back' button and thus increase the
+ ;; `help-make-xrefs' may add a `back' button and thus increase the
;; text size, so `resize-temp-buffer-window' must be run *after* it.
(add-hook 'temp-buffer-show-hook 'resize-temp-buffer-window 'append)
(remove-hook 'temp-buffer-show-hook 'resize-temp-buffer-window)))
(funcall temp-buffer-max-height (current-buffer))
temp-buffer-max-height))))
-;; `help-manyarg-func-alist' is defined primitively (in doc.c).
-;; New primitives with `MANY' or `UNEVALLED' arglists should be added
-;; to this alist.
-;; The parens and function name are redundant, but it's messy to add
-;; them in `documentation'.
-
-;; This will find any missing items:
-;; (let (l)
-;; (mapatoms (lambda (x)
-;; (if (and (fboundp x)
-;; (subrp (symbol-function x))
-;; (not (numberp (cdr (subr-arity (symbol-function x)))))
-;; (not (assq x help-manyarg-func-alist)))
-;; (push x l))))
-;; l)
-(defconst help-manyarg-func-alist
- (purecopy
- '((list . "(list &rest OBJECTS)")
- (vector . "(vector &rest OBJECTS)")
- (make-byte-code . "(make-byte-code &rest ELEMENTS)")
- (call-process
- . "(call-process PROGRAM &optional INFILE BUFFER DISPLAY &rest ARGS)")
- (call-process-region
- . "(call-process-region START END PROGRAM &optional DELETE BUFFER DISPLAY &rest ARGS)")
- (string . "(string &rest CHARACTERS)")
- (+ . "(+ &rest NUMBERS-OR-MARKERS)")
- (- . "(- &optional NUMBER-OR-MARKER &rest MORE-NUMBERS-OR-MARKERS)")
- (* . "(* &rest NUMBERS-OR-MARKERS)")
- (/ . "(/ DIVIDEND DIVISOR &rest DIVISORS)")
- (max . "(max NUMBER-OR-MARKER &rest NUMBERS-OR-MARKERS)")
- (min . "(min NUMBER-OR-MARKER &rest NUMBERS-OR-MARKERS)")
- (logand . "(logand &rest INTS-OR-MARKERS)")
- (logior . "(logior &rest INTS-OR-MARKERS)")
- (logxor . "(logxor &rest INTS-OR-MARKERS)")
- (encode-time
- . "(encode-time SECOND MINUTE HOUR DAY MONTH YEAR &optional ZONE)")
- (insert . "(insert &rest ARGS)")
- (insert-and-inherit . "(insert-and-inherit &rest ARGS)")
- (insert-before-markers . "(insert-before-markers &rest ARGS)")
- (message . "(message STRING &rest ARGUMENTS)")
- (message-box . "(message-box STRING &rest ARGUMENTS)")
- (message-or-box . "(message-or-box STRING &rest ARGUMENTS)")
- (propertize . "(propertize STRING &rest PROPERTIES)")
- (format . "(format STRING &rest OBJECTS)")
- (apply . "(apply FUNCTION &rest ARGUMENTS)")
- (run-hooks . "(run-hooks &rest HOOKS)")
- (run-hook-with-args . "(run-hook-with-args HOOK &rest ARGS)")
- (run-hook-with-args-until-failure
- . "(run-hook-with-args-until-failure HOOK &rest ARGS)")
- (run-hook-with-args-until-success
- . "(run-hook-with-args-until-success HOOK &rest ARGS)")
- (funcall . "(funcall FUNCTION &rest ARGUMENTS)")
- (append . "(append &rest SEQUENCES)")
- (concat . "(concat &rest SEQUENCES)")
- (vconcat . "(vconcat &rest SEQUENCES)")
- (nconc . "(nconc &rest LISTS)")
- (widget-apply . "(widget-apply WIDGET PROPERTY &rest ARGS)")
- (make-hash-table . "(make-hash-table &rest KEYWORD-ARGS)")
- (insert-string . "(insert-string &rest ARGS)")
- (start-process . "(start-process NAME BUFFER PROGRAM &rest PROGRAM-ARGS)")
- (setq-default . "(setq-default SYMBOL VALUE [SYMBOL VALUE...])")
- (save-excursion . "(save-excursion &rest BODY)")
- (save-current-buffer . "(save-current-buffer &rest BODY)")
- (save-restriction . "(save-restriction &rest BODY)")
- (or . "(or CONDITIONS ...)")
- (and . "(and CONDITIONS ...)")
- (if . "(if COND THEN ELSE...)")
- (cond . "(cond CLAUSES...)")
- (progn . "(progn BODY ...)")
- (prog1 . "(prog1 FIRST BODY...)")
- (prog2 . "(prog2 X Y BODY...)")
- (setq . "(setq SYM VAL SYM VAL ...)")
- (quote . "(quote ARG)")
- (function . "(function ARG)")
- (defun . "(defun NAME ARGLIST [DOCSTRING] BODY...)")
- (defmacro . "(defmacro NAME ARGLIST [DOCSTRING] BODY...)")
- (defvar . "(defvar SYMBOL [INITVALUE DOCSTRING])")
- (defconst . "(defconst SYMBOL INITVALUE [DOCSTRING])")
- (let* . "(let* VARLIST BODY...)")
- (let . "(let VARLIST BODY...)")
- (while . "(while TEST BODY...)")
- (catch . "(catch TAG BODY...)")
- (unwind-protect . "(unwind-protect BODYFORM UNWINDFORMS...)")
- (condition-case . "(condition-case VAR BODYFORM HANDLERS...)")
- (track-mouse . "(track-mouse BODY ...)")
- (ml-if . "(ml-if COND THEN ELSE...)")
- (ml-provide-prefix-argument . "(ml-provide-prefix-argument ARG1 ARG2)")
- (ml-prefix-argument-loop . "(ml-prefix-argument-loop ...)")
- (with-output-to-temp-buffer
- . "(with-output-to-temp-buffer BUFFNAME BODY ...)")
- (save-window-excursion . "(save-window-excursion BODY ...)")
- (find-operation-coding-system
- . "(find-operation-coding-system OPERATION ARGUMENTS ...)")
- (insert-before-markers-and-inherit
- . "(insert-before-markers-and-inherit &rest ARGS)"))))
-
-;; Provide this for the sake of define-minor-mode which generates
-;; defcustoms which require 'help'.
-
+\f
(provide 'help)
+;; arch-tag: cf427352-27e9-49b7-9a6f-741ebab02423
;;; help.el ends here